This Part Fits the following kits / parts:

#86349 - HEX WHEEL HUB 12mm (SILVER/4pcs)

MT 2 18SS standard (MT 2/MT/Rush (Rear)/EP MT: Heavy Duty Option)

Cast metal Hex Wheel Hubs are now available for
the RS4 MT line of nitro and electric trucks from HPI Racing. These
metal parts replace the stock plastic hubs for a strong and
secure wheel mounting system. The cast metal design
resists deformation, allowing the wheel nut to be clamped down more
firmly than when using plastic hubs. Built-in ribs help grab the
wheel for added security. Originally designed to help cope with the
extreme power of the 18SS engine in the Nitro RS4 MT 2 18SS kit,
these metal hubs are a low cost upgrade to the Nitro MT, Nitro MT
2, electric MT, and can be used on the rear wheels of the Nitro
Rush trucks.